[Users] Fwd: GeoExt.LegendPanel too slow with too many sublayers

[Andreas Hocevar]

Hi,

everything I see in your demo works as expected. Your servers, however, respond very very slowly.

Your sublayers are not exposed to the layer tree. I see you are using Mapserver. Why don't you just create CLASSes instead of LAYERs for e.g. road categories?

Regards,
Andreas.

On May 11, 2010, at 17:17 , Vito Meuli wrote:

> Hi Andread, hi List!
> I've deployed the faulty webgis.
> The URL is http://www.servizi.taol.it/grottaglie_data/tawebgis5/grottaglietest.html
> 
> You can see I have a LOT of Layers (about 30) and sublayers (about 250) on the left, and a button "Legenda" on the right of the map toolbar.
> 
> The Layers are in a TreeLayer embedded in the viewport:
> ---------------------------------------
>            {
>                id: "tree",
>                title: "Livelli tematici",
>                xtype: "layertree",
>                map: map,
>                enableDD: true,
>                model: model,
>                lines: false,
>                plugins: [mapfish.widgets.LayerTree.createContextualMenuPlugin(['opacitySlide'])]
>            }
> ---------------------------------------
> and I open the legend with a function activated from the button (when the page is fully loaded):
> ---------------------------------------
> function openLegend(){
>    // create the window on the first click and reuse on subsequent clicks
>    if (!winLegenda) {
>        winLegenda = new Ext.Window({
>            applyTo: 'legenda-win',
>            layout: 'fit',
>            width: 600,
>            height: 500,
>            closeAction: 'hide',
>            plain: true,
> 
>            items: new GeoExt.LegendPanel({
>                id: "legend_panel",
>                defaults: {
>                    style: 'padding: 5px',
>                    labelCls: 'legenda_titoli',
>                    imageFormat: "image/png"
>                },
>                autoScroll: true
>            }),
>            buttons: [{
>                text: 'Chiudi',
>                handler: function(){
>                    winLegenda.hide();
>                }
>            }]
>        });
>    }
>    winLegenda.show();
> };
> ------------------------------------------
> 
> Any idea?
> 
> Thank you for your help.
> Regards
> Vito
> 
> 
> ----- Messaggio originale -----
> Da: "Andreas Hocevar" <ahocevar at opengeo.org>
> A: "Vito Meuli" <v.meuli at tecnologieavanzate.it>
> Cc: "GeoExt Users" <users at geoext.org>
> Inviato: Martedì, 11 maggio 2010 9:42:23 GMT +01:00 Amsterdam/Berlino/Berna/Roma/Stoccolma/Vienna
> Oggetto: Re: [Users] Fwd: GeoExt.LegendPanel too slow with too many sublayers
> 
> Hi,
> 
> just an idea (untested): try to create your LegendPanel *after* the tree, and after the map is rendered (e.g. in the Tree's or the MapPanel's "render" event).
> 
> The reason why I think this should work is because the tree, while it builds, will cause the layers to be configured with *only* the *visible* sublayers.
> 
> Regards,
> Andreas.
> 
> On May 11, 2010, at 09:12 , Vito Meuli wrote:
> 
>> [Cross posting from Mapfish-Users]
>> 
>> Hi list!
>> I'm facing a problem with my first production-lever webgis realized with Mapfish+GeoExt.
>> 
>> The customer requires a lot of WMS Layers (about 30), each Layer having a lot of sublayers, so I have about 300 sublayers in my map...non all displayed, of course! :-)
>> They are in a mapfish.widgets.LayerTree, some displayed and a lot of them off.
>> 
>> I'm displaying the legend by means of a GeoExt.LegendPanel.
>> 
>> Now the problem is that GeoExt.LegendPanel loads all of the sublayers images, without considering weather the Layers are on or off...you can imagine it takes 2 minutes to load the LegendPanel!
>> No good.
>> 
>> I'm using old (some months) version of Mapfish and GeoExt...
>> What version are they? I don't know! How can I tell from the code what version  are they? 
>> (I messed up code folders from different version in the process of solving some bugs in the last few months).
>> 
>> I cannot find any message in the list about such a problem.
>> 
>> Can you advise some solution?
>> * New version of GeoExt?
>> * Any parameter that can correct the bad behaviour?
>> 
>> * Reducing the number of sublayers, I know it shoud be done, but it costs a lot of data analisys to understand which sublayers can be merged in a single sublayer.
>> 
>> I'll have the webgis published in a few days, if you need to look at the code.
>> 
>> Thank you in advance!
>> Cheers
>> Vito Meuli
>> -- 
>> ing. Vito Meuli
>> Tecnologie Avanzate s.r.l.
>> via B. Croce 49
>> 70015 Noci
>> BARI
>> 
>> web: www.tecnologieavanzate.it
>> tel. +390804979652
>> fax. +390804979263
>> 
>> -- 
>> ing. Vito Meuli
>> Tecnologie Avanzate s.r.l.
>> via B. Croce 49
>> 70015 Noci
>> BARI
>> 
>> web: www.tecnologieavanzate.it
>> tel. +390804979652
>> fax. +390804979263
>> _______________________________________________
>> Users mailing list
>> Users at geoext.org
>> http://www.geoext.org/cgi-bin/mailman/listinfo/users
> 
> 
> 
> -- 
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
> 
> 
> -- 
> ing. Vito Meuli
> Tecnologie Avanzate s.r.l.
> via B. Croce 49
> 70015 Noci
> BARI
> 
> web: www.tecnologieavanzate.it
> tel. +390804979652
> fax. +390804979263
> _______________________________________________
> Users mailing list
> Users at geoext.org
> http://www.geoext.org/cgi-bin/mailman/listinfo/users

-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.